Attachment for sewing machines



Nov. 27, 1923. y

A.B.MATHNGLY ATTACHMENT FOR SEWING MACHINES 6 Sheets-Sheet 1 Filed Jan. 2.1 1920 ,56 /6 m l 3ra Anventoj:

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Nov. 21,1923. 1,475,235

- A. B. MATTINGLY ATTACHMENT FOR SEWING MAGHIES Filed Jan. 21 120 6 S-h-eets-Sheet 2 2-/' /6 s6 l l 49 5/ 43X lc- 9 5 2@ l T ka l 63 Nov. 275, 1923.I v 1,475,235 v l A. B. MATTJNGLY ATTACHMENT FOR SEWING MACHINES I Filed Jan. 21 g 1920 e sheetssheet s 55 j--Z z 5 www@ Nov. 27 1923.

A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES e Sheets-sheet 4 Filed Jan. 2l 1920 as a s 2 v E. 6@

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Nov. 27,1923. 1,415235 l A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES l'filedqm 2.1.. 1920 6 Sheets-Sheet 6 ua )1o/117 r s.

Patented Nov. 27, 1923..V`

narran Nsra'rais rarsnr orales.

antan ALBnn'rUs B. MATTINGLY, on NEW YORK, 1v. Y.

ATTACHMENT FOR SEWNG MACHINES.

Y Application filed January 21, 1920. Serial No. 352,980.V

T 0 cZZ whom t may concerne.' Y

Be it known that I, ALBnn'rUs B. MAT- TINGLY, a citizen of the United lStates, and

resident of New York, in the county ofy New York and State of New York, have -invented certain new and useful improvements in Attachments for Sewing Machines,

of which the following is a specification.

This invention relates to an improvement in attachments for sewing machines, and the inventor is aware that the device is of a nature similar to that disclosed in British Letters Patent No. 17,153of 1905, to Hills, and United States Patents No. 412,081, to Fletcher, No. 446,736, to Fletcher`l No. 990,- 601, to Seward, and No. 990,610 to Turck, and the object is to overcome some of the objectionable features of these devicesand to further improve thevsame.Y

The principal objects are to providea device of this character to automaticallyy cut or slit the cloth just in advance of the stitching or binding of the button-hole soY that the needle may pass alternatelv through the cloth and then through the slit or out, thus causing the thread' to be brought through the cut and make a perfect binding of the raw edges of the work, and to provide a means for positively actuating` the knife with Ya quick and decisive action at rthe proper periods to make the cut the proper length according to the length ofthe button-holes, and to have the length of cut automatically adjust itself with the adjusting of the device for the length of the button-hole. f y

The further objectsV are to provide av de'- vice of this character which will provide a means for more Vevenly distributingv the stitches around the contour of the buttonhole than has heretofore beenaccomplished, and to provide a means whereby a more perfect adjustment of the cutting device as regards its alinement relative to the needle of the sewing machine is obtained.

The still further objects are to provide a device of this character which by its construction is considerably reduced in height and thereby doing away with the necessity of removing the face plate of the sewing machine to adjust the presser bar, and by the construction of the base plate obviating the necessity of removing the feed dogs of 'the sewing machine. c

The still further objects'are to provide an improved ratchet y device for effecting the lateral vibration of the work clamp, to produce the overstitch of the edge of the button-hole, and to form'other parts of the device by the stamping process, machines, which is the cheapest method of manufacturing devices of this class.

A still further object is to provide a device of this kind in which the knife can be adjusted to out a line or slit in which the needle will Vfollow `with its inside lines of its vibrating motion on its forward movement and 'also perform the Vsame function on its backward-movement in forming or stitching the button-hole.

lVith these and other objects in view, it will be seen that I accomplish the foregoing, by referring to the accompanying drawings forming a part of this specification; 'but l do not wish to confine myself to the exact construction shown, as l have, for the sake of clear illustration, Aexaggerated some of the parts, especially in thel side elevations, and the cam faces of the yoke upon which the eccentric cam works.

ln the accompanying drawings, showing one embodiment of my invention, Figure 1 is a plan view of the device; Fig.l 2 is a similar view to Fig. 1, partly broken away to show the revolving disk and the cam for moving the work clamp; Fig. 3 is a similar view to Fig. 2, with the revolving disk removed Fig.

4isa similar view to Fig.V Sand a` section taken on line %4 of Fig. 5; Fig. 5 is a side elevation; Fig. 6 is a sectional Vview taken on the line 6-6of Fig. 5; Fig. 7 is a similar view to Fig. 6, with the knife and its operating means removed; F 8 is a similar viewfto Fig. 7,with the work clamp removed showingV the vibrating means; Fig.

9 is a similar view -to Fig. 8, with the vibrating means removed; Fig. 1() is a central vertical sectional view; Fig. 11 is a perspective view of the operating lever; Fig. 12 is a detail plan of the vibrator; 13 is an end elevation Of the vibrator; F ig."14 is a side'elevation ofV the vibrator; Fig. 15 is'a perspective view of the lvibrator carrier; Fig. 1,6 is a plan of the supporting plate; F ig. 17 is a bottom plan of the revolving disk; Fig. 18 is a central section of the revolving disk; Fig. 19 is a plan of the cammingplate; Fig. 20 is a side eleva-tion of the camming plate; Fig. 21 is a plan of the knife-c`arrier;'Fig. 22`is a side elevation of the knife carrie-r; Fig. 23 is a plan of the knife shield and integral therewith the stripper plate for theneedle and the guide for the work clamp ;l Fig. 24 is a side elevation lof Fig. 23; Fig. 25 is a pl-an of the work clamp; Fig. 26y is a plan of the ratchet cam; Fig. 27 is a sectionbf the ratchet cam; Fig. 28 is a plan of the pawl plate of the vibrator; F ig.` 29 is a plan of the spring 30 is a bottom plan of the cam member showing the cani fo-r operating `the knife vand the race ycam for controlling the work clamp, Fig. 31 is a plan of theupp'er portion of the assembling stud lcarrying the brake springs; Fig. 32 is a side elevation of Fig'. 31; Fig. 33 is a plan of the lower 'portion of the assembling stud and Fig. 34 is a side elevation of Fig. 33; Fig. 35 is a plan of the linkage for alining the workv clamp and knife with the needle; Fig. v36 isa" diagrammatic view showing lthe movement'of the work clamp and cam when the operating cam moves in a circular motion; Fig. 37 is a view similar to Fig. 3G, but showing the cam moving in an elliptical path; Fig; 38 is an enlarged transverse sectional view 'taken through the work clamp on line 2-2, Fig. 2; Fig. 39 is an enlarged central sectional view of the lower stripper plate; Fig. is an enlarged perspective view of the stripper plate. f

provide a suit-able base plate 1, which is secured to a rear throat plate 2 of the sewing machine in any suitable manner, but 35 preferably screwedV thereto, as shown in Fig. 1 of the drawings. y,

r1`he base plate 1 is provided with 'an ear 3, which is upwardly turned and carries the operating lever 4, which rocks on a pivot 5 N with an arc-shaped slotl 7 through which passes the arm of the friction clutch, which rreceives its movement from the screw 8 fin 'the ear 9 and the reai' endv 10 of the slot 7. The screw 8 isvfricti'onally held from turning by the pressure ofthe spring* 11 against its-head and the 'ear 9; The lever 4 is further provided vwith an arm or downward extension which has a bifurcated end 12 which operates thepawl 13 andthe pawlpla-te 14 by the lever 15, which is mounted on the throat plate'2 by means of a body screw forming al pivot 1G. In the forward end or" the lever 15 is a pin 17 (see Figs. 9, 28 and 29) which operates the pawl 13 and the pawl plate 1,4 through the slots 18 and 19.

The base plate 1 is further provided with a'pivot orA stud 2O mad-e up ofitwo parts 21 and 22. Thel lowerportion 21-4` ofthe 'stud pawl for operating the ratchet cam; Fig.`

is hollow and has its upper and lower ends.

turned down, leaving a body portion 23 which :is slottedon opposite sides forming grooves 24 for the reception of the eXtensions 25 of the part 22, and a washer 26 is forced o n to the lower part of the part 21. The'washer'26 forms a. substantial base for holding the stud in avertical position on the base plate, which is done by the screw 21.7 passing through the washer and the base plate 1 yand the hollow part 21 and being screwed into the part 22, which locks all of the several parts assembled on the stud in position by its head 28, in which are secured ingleiferland is operated by the screw and the rear end of the 'slo't 7, the screw 8 forcing the dog and ring backwards and relievingthe pressure on the cam member. The springs 29 bearing against the surface 37 prevent the cam `memberfrom turning, and the rear lend of the slot forces the dog forward and causes the nose 38 to bite or grip the surface 39 of the cam member 30 and revolve Vthe same a predetermined amount, which is regulated by the screw 8. The plate 40 iXed on the upper face of cam 30 keepsfthe ring in position.

Rotatably mounted upon the stud 2O and supported by the washer 26 are the pawl 13 and the pawl plate 14 (which are swung in `an arc by the end '12 ofthe lever 4 through the vlever 15 andV its pin 1'?, in a. forward and Vbackward movement). mounted upon the stud 2O and resting upon the pawl plate 14 is a ratchet cam 41, which receives a step by step rotary movement from the upturned end 138 oi pawl 13 kextending through afslot in plate 14 and engagingY inturn the notches 137 of ratchet cam 41,y and which operates the vibrator 56, which has its support on the pawl plate and is pivoted on the pin 51 of the L-shaped member 52.

The base plate 1 is further provided with a cut-away portion 43 in which is located a linked member 44 having a slot 45 and a circular opening 46 which fits the head of the screw 27 which acts as a pivot. Secured to the forward end or" the linked member 44 needleandthe 'studf20 andVL held in this rpo- Rotatably sition by the `lock nut 50.y The slot 45 is for receiving the bottom end of the pin 51 of the L-shaped memberv 52, which is provided with a slot 53 for adjusting it upon the base plate 1 by' the screw 54, and itis provided with an upturned ear 55,1301 adjusting it while the screw 54 is loose. The pin 51 is tight in the member 52 and its upper end forms a pivot for the vibrator 56, which is connected thereto by the hole 57 in the ear 58, and when assembled the ear 58 is capable of passing under the pawl 13 and pawl plate 14, while the yoke 59 straddles the ratchet cam andrrests upon the pawl plate 14. The L-shaped member 52 is to regulate the width of bite of the overstitch which is made by the throw or transverse movement of the work clamp, by moving the member 5 2 so that the pin 51 is moved to and from the stud 20. The nearer the pin 51 is to the stud 20 the greater the transverse movement of the work clamp.

The vibrator 56 is provided with a pivoted block 60 which fits the inner faces of the rear yoke 62 of the work clamp 63, which straddles the stud 20 and rests on the supporting plate 61, which, working in conjunction with the cam member 30, keeps the forward part 64 of the work clamp in proper Contact with the base plate 1 and prevents the bottom plate 65, which carries the stripperplate 160, from leaving the slotted way 66 in the base as it is oscillated by the work.

clamp in connection with the ears 67.

ln order to insure a clean straight cut in the fabric in which'a button-hole is to be worked, l provide a stripper plate 160 (see Figs. 38-40) whichv is pivoted at 161v to the plate and is cfa width equal to the inside ofthey lower jaw of the work clamp which it fits, the sides 162 acting'as guides on the' inner side of the work clamp to always `keep the Tshaped slot in perfect alinement with the knife, which is also guided by the innersurface ofv the work clzmip, and this allows the surface 163 to act as a cutting edge for the knife andv vallows it to make a shearing cut instead of a puncture as was the case in the former patents cited. It is understood that the work clamp always oscillates in an arc controlled bythe pin 86 and that the plate. 65 oscillates in a straight line. Thus the T- shaped slot when in the plate 65 had to have the part 164 wide' enough t0 prevent the knife from hitting it when the work clamp' was at various angles to the plate, and therefore prevented a shearing cut.

' The supporting plate 61 is held in position by resting on the shoulders 68 of the bottom part ofV the stud 21, which fits the Vhole 69 provided with slots through which pass the extensions 25 of the upper part 22 of the stud 2O and prevent it from'turning and `eausing the springs 29 to actl as friction brakes on the cam member 30, for which the upper part acts as a journal. rIhe screw 27 pulling down on the part 22 pinches the platei 61'between the shoulder 68 and the part 70 of the upper part 22 of the stud.

Mounted upon the yoke 62 is the guide or shield 71 for the knife carrier 72, having its front end 73 in the form of a stripping plate which slides in a groove or space 74 formed by a plate 75, which Vis'forced into the upper jaw 76 of the work clamp. The groove 74 acts asa guide rto keep the stripping plate 73 in line with the work clamp. The rear end of the shield 71 is enlarged, forming a guide 77, by means ofthe downwardly extending flanges 78 fit-ting the yoke 62,

which moves back and forth relatively to yrevolving disk is moving the work clamp back and forth the length of the buttonhole). i Y

Mounted upon the guide or shield 77 is the knife carrier 72', which has its spring portion 84 passing through the openings 85 and 86 of the shieldjTl, which acts as guides for the carrier. The spring portion 84 has its outerend bent upward, with two earsV 87 forming a pair of jaws for the knife 88, which is held by a pin or screw 89. The rear end of the spring portion 84vis formed in a rectangular frame or yoke 90 having a flange 91 forming a cam face 92 against which the cam 93 secured to the cam member 30, works, and the iexible portion 94 insures the keeping of the cam 93 and the cam face .92 always in contact. At a predetermined point the flange 91 forming the cam face 92 is cut away or ends at 95, and the yoke is so formed at this point to have a clearance space 96 to prevent the yoke frame from hitting the cam 93 when the exible part-94 of the yoke causes the yoke and. knife to move quickly back between the strokes of the needle and thus preventthe needle barfronrstriking the knife several times while it is being moved back from under the needle bar. This quick movement is caused by the cam 93, which holds the yoke for" ward for the propertime, having an abrupt drop 97, so that while it is revolving' on the Astud 2O the point 98 passes the point 95 on the cam 92. The point 98 isso formed as to not interfere with the pointr95, and this allowsthe yoke'to move back its full stroke Y at this point, which is accomplished on one of the upward strokes of the needle bar.

.Mounted iixedly on the-top of the stud 20 and held in place by dowel pins 99 is a camming plate 100, which works in conjunction`with the driving plate 101 secured to the cam member 30 and which causes the revolving disk 102 to revolve in the path of an ellipse relative to the stud 20 and havingy its major axisin line with the work clamp and its minor axis transverse therewith and the intersection of its axes to the rear of the stud 20. The revolving of the disk in an elliptical path is caused by its'pivot pin 103 shifting its position in the slot 104 vas it revolves. The shifting of the pin is caused by the pivoted cam 105 sliding in the shallow slot 106. It will be noted that the slot 104 is deeper than the slot 106; this is to prevent the pin 1.03, from ,entering the slot 106 at the critical point when the disk 102 is being driven by the driving plate 101, which is connected toY the disk 102 by the pivoted cam or block 107, which is free to slide in the slot 108 of the driving-plate.

The foregoing movement will be more clearly understood by referring to Fig. 3, where l: have indicated by dotted lines the positions of the pivoted cams and pinsb-and the starting position of the driving plate i for each cycle. To make a button-hole, with the driving plate in the position indicated in dotted lines 109, the cam 107 will be at 110 and the pivot pin 103 at 111 and cam 105 at 112. Vhen the driving plate reaches the position indicated at 113 the cam 107 will be at 114 and its center will represent the end of the minor radius of the ellipse and the cam 105 will be at 115 and the pivot pin 103 will be in the center of the camming plate. While the driving plate is moving to the position shown in full lines the pivotkpin 103 moves along the slot 104' to 116 and the cam 105 returns to the center of the camming plate, and as the driving plate continues its circular movement to the position `109 the cam 105 moves over to 117 and backV to the center of camming plate. l Mounted upon the revolving disk is an adjustable cam 118 held in position by a stud 119 having a rectangular head 120 which fits the recess 121 and which guides it in its movement. The stud passes through a slot 122 and the cam into a screw cap 123, which causes the cam 118 to bind against the disk 102. This cam moves in an elliptical path, and the lengths of the axes are changed bythe 'adjustment of the cam yon the disk L102 relative to the pin 103. The 118 performs the function of the eccentric cam of. the patents mentioned in this specification and produces a more satisfactory result.

The cam 118 moves the work clamp forward and back from the stud 20 and in line with the needle throughthe yoke member 2124,*which is secured to the work clamp and is provided with a slot 125 in which the cam 118 is located, and as the cam revolves it works against'the face 126Y rst to drive the clamp forward and against the face 127 to draw'the clamp back. The yoke member 124 kis secured to the work clamp 63 by means of screws 128, andthe forward end is bifurcated and bent so as to form bearings'for the locking member 129, which is formed ofa bent wire hai/'ing a central portion 130 which acts in the capacity of a hand. lever to operate the two end portions 131 which act upon the spring extensions k132 of the upper jaw 63 and which are riveted to the rear yoke 62 of the work clamp.

Mounted on the underside of the base plate 1 (see Figs. 8 and 9) is a spring member 133, which is held in position by the rivets 134 and has ,an upwardly extending portion 135 which extends through the opening 136y of the pawl plate 14 and into the holes 137 of the ratchet cam 41. This prevents the ratchet cam from being turned backwards by friction of the end 138 of the pawl slipping out ofA any one of the holes 137 upon its backward movement after it has revolved the ratchet cam one-tenth of a turn.

` The baseA plate is further bent or formed so as to have a raised portion 139 through the center thereof` upon which the bottom of the' work clamp slides and on which is cut the channel or groove 66 for the plate 65, on which is pivoted the stripper plate, which has. an opening 140 somewhat in the shape of a T. Beneath 'the stripper plate '160 in the base plateis an opening 141 and a similar one in the plate to allow the needle to perform its functions. The raised portion 139/ forms a channel or groove 142 (see` Fig'. 10), which'allows the free action `of the feed dogs of the sewing machine and raises the device enough to permit the cutting of the cloth without the knife` hitting the dogs on its downward stroke.

Theoperation of the device is very simple. The rear throat plate of the sewing machine is removed and the device is slipped in its place by the insertion of the throat plate 2 .l

which is screwed to the device, and the shank of the screw which holds the needle in position passes' into the bifurcated end 6 of justed for any width of vibration for the work clamp. The screw 54 is then tightened and the attachment 'is ready foroperation.

.It will be understood that-,after the knife has beenonce adjusted for the needle the attachment can beV removed if desired and put back without the knife being readjust` ed, and the vibrating movement ofthe work clamp Vcan also be clianged to take more or less bite when the attachmenty is adjusted to make a larger or smaller button-hole, without disturbing the adjustment of the knife.

To make a button-lio` e, the work clamp is set by operating the sewing machine until the extreme back position is reached. rlhe lever 130 of the locking member 129 is then pressedl forward, (that is, in the direction of the needle), and forces the ends 131 backwards and thus relieves the pressure of the springs 132, which allows the jaws of the work clamp to open. The cloth is inserted between the jaws and the lever 130 pushed back to its original position, thus causing the upper jaw to force the cloth down into the concave opening in the lower jaw, and at thesame time the flanges 143 of the upper jaw prevent the slipping of the cloth on the lower jaw and thus causes the cloth to be stretched like a drum head. With the work clamp in this position the knifeV is in the dotted position shown in Fig. 5, and upon ruiming the machine the needle bar strikes the top of the knife and forces it through.

the cloth each time the needle descends, making a shearing cut against the edge 163 of stripper plate 160, until the work clamp is almost at its eXtreme forward position, when the cam 93 is at the point where the point or nose 98 passes the point 95. The flexible portion 94 ofthe yoke causes the yoke to move swiftly back and draw the knife out of line with the needle bal before it has time to descend. and strike it again, (as sho-wn in full lines in Fig. 5), thus preventing further cutting, and the knife remains in this position until the button-hole is finished.

Thestud 20 is the pivot center upon which the work clamp is oscillated by the vibrator 56. With each upward movement of the needle bar the lever 4 is raised7 which 'in turn swings the pawl plate 14 sutliciently to have Vthe pawl 138 act on one of the holes 137 of the ratchet cam and revolve it onetenth of a revolution, which Vcauses one of ,the pointed cam faces 143 to act on one side of the yoke 59 and cause the vibrator to swing to one side on its pivot 51. The face 144 prevents any overthrow of the vibrator. The next stroke of the needle causes one of the faces 143 to act on the opposite side of the yoke 59 and swing it in the opposite direction. This movement of the vibrator causes the work clamp to be oscillated on its pivot 20, such motion being transmitted through the block 60 of the vibrator. W hile the vibrator is Oscillating the work clamp in one direction or the other with every stroke of the needle to make the needle pass first through the cloth and then through the cut, the elliptical cam is slowly shoving the .work clamp forward the length of the button-hole, the speed of the forward movement being regulated by the screw 8, which strikes the arm or lever 36 of the friction clutch' and forces the ring 31 back a predetermined amount, (jupon the downward stroke of the needle). The rear end 10 of the slot 7, upon reaching the arm 36, (on the upward movement of the needle) forces the ring to move forward and the nose 38 to bite into the cam member 3() and cause it and the revolving disk to revolve, which causes the cam 118 to act upon the face 126 of the Y yoke member 124 and shove the work clamp forward, and when the cam, on the last works against the face 127 it causes the work clamp to be drawn backwards. The revoltrving of the cam member 30 causes the pin to shift its position while the button-hole is being made. This is due to the pin 89 being held relative to the stud 2O by the groove 81 and in the start is in the portion 145 which forms a part of the back end of the button-hole, that is, the part which is furthest from the edge of the garment. The part 146 vholds the pin in a position so that the vibrator will vibrate the work clamp up one side of the slit which is being made by the knife for the button-hole. The part 147 then causes the pin 8O to move nearer to the stud 20, and this causes the first part of the loop or eyelet to be made, and the part 148 causes the pin 80 to move the farthest away froml the stud, and this causes the semi-circular end of the eyelet to be made. The part 149 causes the pin 8O to move near to the stud, and this causes the completion of the eyelet. The pin is then held in position by the part 100 until the vibrating of the work clamp down the other side of the slit completes the button-hole by the pin going to its original position in the'portion 145. This operation forms what is known by the trade as the eyelet or looped buttonhole. It will be noted that the cam member 30 revolves an equal distance at each stroke of the needle, and if the cam 118 were attached directly tothe cam member the cam 118 would move in a circle and would pile up too many stitches at the end and make a defective button-hole; but by having the cam move in an elliptical path this is obviated. Of course it is desirable to have the stitches a little closer at the back end than on the side, but not to the extent which `would be produced if the circular movement llO of the needle or for every ten stitches, and the point where each dotted line 150 touches the semi-circle 151 indicates where the cam 118 would be; for instance, after the first ten stitches it would have moved from a to b and the second tenY stitches from to c and so on until after a hundred and vtwenty stitches it would be at m and the first half of the button-hole would be finished, and the reverse movement would under the same conditions, while the cam 11,8 is completing the circle, complete the button-hole. The vertical lines 152 represent the forward movement of the cam 118 and the horizontal lines 153 the work clamp, and the vertical lines 154 represent the forwardv movement of the work clamp. It will be noted that all of the lines 153 are exactly the same length in both figures, and when the cam- 118 moves from a to b teny stitches are crowded into the space between n and 0,

and when it moves from Z) to c ten are. made in the space from 0 to p, and so on, and as the cam 118 moves from a to g each of the spaces 1.55 from n to t increases in length and thus it will be seen that entirely too many stitches are crowded into the space from n, to 0y and 0. to p, while from p to g the stitches would be normal andv q to r would not have sufficient Stitches, and r to s and s to t entirely too few, and the exact reverse condition would exist while the cam 118 is movingfrom g to m andl the clamp from t to e. Thus it will be seen that the circular movement gives a very uneven stitching of the button-hole, by pilingup too many stitches at the back end and entirely too few at the eyelet end, as the distance of travel or space is greatly increased bv the curvature of the eyelet. Iti'will be noted that the work clamp needs to be retarded at the eyelet end in order to allovv7` more stitches to be made while the eyelet is being formed, and I accomplish this byy having` the cam 118 move in an elliptical pat-h and by having the minor axis of the ellipse to the rear of the center of the studf 20, as will be seen by referring'to Figs.`

3, 19 and 37. It willbe noted that the cam 118 follows an elliptical path, indicated by the line 156, and when the cam member 30 moves from a to Y) the cam 118 moves from a to b, and when the cam member has moved to c the cam has moved to 0, and so on, and the clamp has movedfrom n to 0 while the cam member has moved from a to and the cani from a to b', and so on. It will be noted that the' spaces n-0 are suitable for theV back end and the space 0-p is almost normal 'and the spaces 20C-g and qr are normal, and the spaces r-s to y-a are gradually shortened in order to compensate for the increased travel or lengthened space to be stitched while the eyelet is being formed,

and the workclamp, at this point is mov-k ing in av line forming aI compound curve instead of ar straight line, and the retard.-v ing of forward movement allows the sewing machineto supply suicient stitches to make the eyelet have the proper number of stitches to compare with the sides of the button-hole. It is understood that the formation of theother side of the buttonhole is the exact reverse of the movements shown in the diagrams and that the diagram in Fig. 37 showsfthe movement ofthe work clamp relative to the needle and the stud of the attachment, it being understood that the back end of the button-hole is the beginning ofv the operation and also theA ending of the operation and that the back end is made while the work Clamp is mov-l. ing forward from n to 0 and the sides from 0 to t and the eyelet end from t to a7, or in other words, in the operation of makino' the button-hole the work on the button-hoIe is always in the reverse direc; tion to the movement ofthe rwork cla-mp.

It will be understood that I have stated for convenience of illustration that ten stitches are made between each of these divisions;

but by regulating the screw 8 any number'.

of stitches can be made between the divi.- sions; and from the foregoing it will be,v clearly seen that the ellipticaly movement places the stitches very evenly along, the

sides of the button-hole and does. not over` move laterally, means for reciprocating the` work-holder, means for vibrating the work-A holder, a cutter blade carried by the workholder to partake of its saidl movements,

said'workholder being connected with said?. carrier and cutter-block toshi-ft the carrierr 4laterally on vibration of the work-holder,

whereby to maintain the cutter-block paralf lel with the blade during said'vibration of the work-holder.

2. In a button-hole stitching attachment, the combination of a base-plate, a carrier slidable laterally, a cutter-block pivoted' on the carrier, a work-holder mounted to reciprocate relative to the carrier and also to move laterally, means for reciprocating the work-holder, means for vibrating the workholder, a cutter blade carried bythe work holder to partake of its said' movements, said cutter-block on the carrier having -a sliding connection with the work-holder wherebythe carrier will be shifted laterally' as the work-holder is vibrated, and the cutter-block will maintain its position in the longitudinal axis of the work-holder and remain parallel with the cutter blade.

8. In a button-hole stitching attachment, the combination of a base-plate, a carrier slidable laterally, a cutter-block pivoted on the carrier, a work-holder mounted to reciprocate relative to the carrier and also to move laterally,'means for reciprocating thev work-holder, means for vibra-ting the work-holder, a cutter blade carried by the work-holder to partake of its said movements, means for moving the cutter blade along the work-holder, said cutter-block on the carrier having a sliding connection with the work-holder whereby the carrier will be shifted laterally as the work-holder is vibrated, and the cutter-block will maintain its position in the longitudinal axis of the work-holder and remain parallel with the cutter blade during vibration of the workholder and travel of the-blade.

4;. In a button-hole stitching attachment, the combination of a base-plate, a carrier slidable laterally on the base-plate, a cutterblock pivoted on the carrier, said cutterblock having a T-shaped slot, a work-holder mounted on the base to reciprocate relative to the cutter-block and also movable laterally whereby to feed material to be engaged by a needle reciprocating in a fixed path at the slot of the cutter-block, a cutter blade mounted on the work-holder and movable along the work-holder, to be engaged by the needle bar and forced through the material in the work-holder and to co-opcrate with one edge of said block slot, said cutter-block having a slidable engagement with the work-holder whereby the vibration of the work-holder will cause lateral movement of the carrier and also a swinging movement of the block on the carrier to maintain said cutting edge of the block parallel with the cutter blade.

5. In an attachment of the character stated, the combination of stitching mechanism including a needle, a work clamp, means for reciprocating and vibrating the work clamp, a knife carried by the work clamp for cutting a buttonhole in advance of the stitching, a knife shield terminating in an upper stripper plate mounted on the Work clamp, and means for preventing the knife shield from reciprocating with the work clamp but permitting it to vibrate with the clamp relative to the needle, a lower stripper plate having a substantially T- shaped slot therein, means for maintaining a portion of said slot in alignment with said knife whereby a shearing cut may be effected, a spring member for supporting the knife which spring member has a yoke formed in the end thereof having a cam face and a rotary cam for co-operative engagement with said cam face.

6. In an attachment of the character stated, the combination of a base plate, a work clamp, a work plate operable by said work clamp in a lateral manner with respect to the base plate, a stripper plate pivoted to said work plate and having a substantially '-shaped slot therein, a cutting device operable through said slot and means for maintaining a portion of said slot in alignment with they cutting device whereby a shearing cut may be effected.

7. ln an attachmentv of the character stated, the combination of a base plate, a work clamp, a work plate operable bysa-id work clamp in a lateral manner with respect to the base plate, a stripper plate pivoted to said work plate and having a substantially T-shaped slot therein, a needle bar, a cutting device carried by the work clamp and operable through said slot, said cutting device being disposed in the path of travel of said needle bar and means for maintaining a portion of said slot in alignment with the cutting device whereby a shearing cut may be effected.

8. In an attachment of the character stated, the combination of a base plate, a work clamp, a work plate operable by the work clamp in a lateral manner with respect to the base plate, a stripper plate pivoted to the work plate and having a substantially T-shaped slot therein, a needle bar, a cutting device carried by the work clamp and operable through said slot, said cutting device being disposed in the path of travel of the needle bar, means for maintaining a portion of said slot in alignment with the cutting device whereby a shearing cut may be effected and means for withdrawing the cutting device from the path of travel of the needle bar at predetermined periods.

9. n an attachment of the character stated, the combination of a base plate, a needle bar, a reciprocal work clamp, a knife carried by the work clamp and normally in the path of travel of the needle bar, a work plate operable by the work clamp in a lateral manner with respect to the base plate, a knife shield mounted upon the work plate and terminating in a stripper plate, a pivotal stripper plate having a substantially T-shaped slot therein for the passage of said knife therethrough, means for preventing the knife shield from reciprocating with the work clamp and means for maintaining said slot in alignment with the'knife whereby a shearing cut may be effected.

l0. In an attachment of the character stated, the combination of a work clamp afforded a reciprocal and vibratory movement, a needle bar, a spring member carried by the work clamp and having a yoke formed at one end thereof, a cam face formed in said yoke, a rotary cam co-operatively disposed with respect to the cam face, a knife Civ carried by said spring member and advanced at predetermined periods by said rotary earnv attachment 0i the character stated, the combination ot' a base plate, a-

Work plate movable laterally with respect thereto and a stripper plate movable in an are of a circle with respect to the Work plate and having` a substantially T-shape-d slot therein. t

l2. An attachment as described in claim ll characterized by a knife movable through said slot and means operative to maintain a portion of -said slot in alignment with said knife whereby a cutting edge is always present in order that said knife may effect a shearing cut.

Signed at New York,A in the county of New York and State of Newv York, this 31st day of Decemberi A. D. 1919.

ALBERTUS B. MATTNGLY. 

